Theorem f1eq1 2776

Description: Equality theorem for one-to-one functions.

Assertion

Ref	Expression
f1eq1	⊢ (F = G → (F:A–1-1→B ↔ G:A–1-1→B))

Proof of Theorem f1eq1

Step	Hyp	Ref	Expression
1		feq1 2748	. . 3 ⊢ (F = G → (F:A–→B ↔ G:A–→B))
2		cnveq 2513	. . . 4 ⊢ (F = G → ◡F = ◡G)
3		funeq 2683	. . . 4 ⊢ (◡F = ◡G → (Fun ◡F ↔ Fun ◡G))
4	2, 3	syl 12	. . 3 ⊢ (F = G → (Fun ◡F ↔ Fun ◡G))
5	1, 4	anbi12d 476	. 2 ⊢ (F = G → ((F:A–→B ∧ Fun ◡F) ↔ (G:A–→B ∧ Fun ◡G)))
6		df-f1 2435	. 2 ⊢ (F:A–1-1→B ↔ (F:A–→B ∧ Fun ◡F))
7		df-f1 2435	. 2 ⊢ (G:A–1-1→B ↔ (G:A–→B ∧ Fun ◡G))
8	5, 6, 7	3bitr4g 428	1 ⊢ (F = G → (F:A–1-1→B ↔ G:A–1-1→B))

Syntax hints:   → wi 2   ↔ wb 127   ∧ wa 196   = wceq 1091  ^◡ccnv 2409  Fun wfun 2416  –→wf 2418  –1-1→wf1 2419

This theorem is referenced by:  f1oeq1 2795  f1domg 3299  infxpidmlem7 4939

This theorem was proved from axioms:  ax-1 3  ax-2 4  ax-3 5  ax-mp 6  ax-4 673  ax-5 674  ax-6 675  ax-7 676  ax-gen 677  ax-8 798  ax-9 799  ax-10 800  ax-11 801  ax-12 802  ax-13 804  ax-14 805  ax-16 922  ax-17 925  ax-ext 1074  ax-rep 1075  ax-pow 1077

This theorem depends on definitions:  df-bi 128  df-or 197  df-an 198  df-ex 679  df-sb 853  df-eu 1009  df-mo 1010  df-clab 1093  df-cleq 1097  df-clel 1099  df-v 1349  df-dif 1489  df-un 1490  df-in 1491  df-ss 1492  df-nul 1708  df-pw 1799  df-sn 1811  df-pr 1812  df-op 1815  df-br 2063  df-opab 2098  df-id 2125  df-rel 2425  df-cnv 2426  df-co 2427  df-dm 2428  df-rn 2429  df-fun 2432  df-fn 2433  df-f 2434  df-f1 2435

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